actualy i think a damage count could be darn interesting (not good for the game but darn interesting).
My money is on arcanes, clerics and rogues being at the top with barbs below and every one else below that.
role reversal for most raids.
2HF will come in before 2WF in most quests, 2WF in most raids.
Fact is a well played arcane or cleric will dominate the damage numbers due to AOE spells and instakills (which should account for any health remaining).
All this joking aside ask your self this - how much damage is a mass hold monster worth? how much damage is haste worth? how much damage is healing worth?
If you want to mess with the kill count (which is usefull purely for a bit of 'legolass and gimli' style fun) then go the whole hog with it.
FOR EACH PLAYER:
damage dealt, over damage dealt, kill count, damage taken, damage mitigated on player X(through buffs or items or abilities), health healed, over heals recieved, number of mobs incapacitated, amount of healing given, amount of overhealing given, traps disarmed, buffs cast, buffs recieved, percentage of player X's damage directly atributable to this player - eg hold spells haste bard song etc.
Now that kinda list would let people work out the kinks in their characters and more support oriented chars would be recognised for giving said support. further more it would show just how much damage a decent arcane, bard or cleric brings to the mix.
All that being said i think this is a waste of developer time, and a third party program that analyses the combat log would be the way to go for those interested. It should be obvious enough already if some one is not pulling their weight.